True, but difference is that Sony's and Wii's have remotes that serve as standins for things that appear in almost all games that appeal to 'hardcore gamers'. The idea of playing as Kratos and swinging his weapons around yourself is way more inviting than say... putting tires together... or pretending to skateboard by jumping around. These seem more like thigns that appeal to 5 year olds than everybody.
Shane Kim said; in an interview i posted 3 pages behind, when asked if Natal was going to be incorporated in hardcore titles like Halo or Gears; that it can be done, but that´s not their main focus initially.
When also asked if he was going to change the internal development to focus less on hardcore and more on casual, he said that Microsoft Game Studios doesn´t have games like the ones demoed on stage, so, no Ricochet nor Paint Party are in the making.
By other words, Natal will not transform the 360 into a Wii, and i say that in the worst way possible, meaning the all crapfest third party casual games that are made.
There will be casual games, even some dumb ones by third parties, but i believe that is not MS´s intention for it to happen.
In my understanding, and Kim said this in another interview i read from him, when Natal arrives there will be 3 types of games.
The traditional ones (traditional controllers are not going anywhere, his own words), Natal games, and hybrids, this last ones mean that some games (and i believe it will be a big majority) will incorporate some of Natal´s functionalities, but still remain tradicional (giving orders to squad members or something in this lines, or an FPS where you are the camera, by looking around).
But one thing i believe is that the 360 will not start to have games for "5 year old".
The point is, we have no idea of what is in store for Natal, only the developers and Microsoft know, and i believe that we have only seen the tip of the icerberg.
The demos on the E3 stage was just to give an idea of what can be done, but they are not being made.